Commit | Line | Data |
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5ce34554 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * lowlevel.c | |
4 | * | |
5 | * PURPOSE | |
6 | * Low Level Device Routines for the UDF filesystem | |
7 | * | |
1da177e4 | 8 | * COPYRIGHT |
1da177e4 LT |
9 | * (C) 1999-2001 Ben Fennema |
10 | * | |
11 | * HISTORY | |
12 | * | |
13 | * 03/26/99 blf Created. | |
14 | */ | |
15 | ||
16 | #include "udfdecl.h" | |
17 | ||
18 | #include <linux/blkdev.h> | |
19 | #include <linux/cdrom.h> | |
e973606c | 20 | #include <linux/uaccess.h> |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include "udf_sb.h" |
23 | ||
cb00ea35 | 24 | unsigned int udf_get_last_session(struct super_block *sb) |
1da177e4 | 25 | { |
8b075e5b | 26 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
1da177e4 | 27 | struct cdrom_multisession ms_info; |
1da177e4 | 28 | |
8b075e5b CH |
29 | if (!cdi) { |
30 | udf_debug("CDROMMULTISESSION not supported.\n"); | |
31 | return 0; | |
32 | } | |
1da177e4 | 33 | |
8b075e5b CH |
34 | ms_info.addr_format = CDROM_LBA; |
35 | if (cdrom_multisession(cdi, &ms_info) == 0) { | |
1da177e4 | 36 | udf_debug("XA disk: %s, vol_desc_start=%d\n", |
a983f368 | 37 | ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba); |
28de7948 | 38 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
8b075e5b | 39 | return ms_info.addr.lba; |
1da177e4 | 40 | } |
8b075e5b | 41 | return 0; |
1da177e4 LT |
42 | } |
43 | ||
bd904f3c | 44 | udf_pblk_t udf_get_last_block(struct super_block *sb) |
1da177e4 | 45 | { |
e4ae4735 | 46 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
1da177e4 LT |
47 | unsigned long lblock = 0; |
48 | ||
24a5d59f | 49 | /* |
8b075e5b | 50 | * The cdrom layer call failed or returned obviously bogus value? |
24a5d59f JK |
51 | * Try using the device size... |
52 | */ | |
bd904f3c JK |
53 | if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0) { |
54 | if (sb_bdev_nr_blocks(sb) > ~(udf_pblk_t)0) | |
55 | return 0; | |
e4ae4735 | 56 | lblock = sb_bdev_nr_blocks(sb); |
bd904f3c | 57 | } |
1da177e4 LT |
58 | |
59 | if (lblock) | |
60 | return lblock - 1; | |
8b075e5b | 61 | return 0; |
1da177e4 | 62 | } |